<snapdata remixID="14980292"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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select="1"><scene name="U3L1-ShoppingList_Empty to Students"><notes></notes><hidden></hidden><headers></headers><code></code><blocks><block-definition s="map %&apos;function&apos; over %&apos;lists&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%mult%l"></input></inputs><script><block s="doWarp"><script><block s="doDeclareVariables"><list><l>mapone</l><l>mapmany</l></list></block><block s="doSetVar"><l>mapone</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="evaluate"><block var="mapone"/><list><block s="reportCDR"><block 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lists"/></list></custom-block></list></block></block></block></script><list><l>data lists</l></list></block></block><block s="doIfElse"><custom-block s="empty? %l"><block s="reportCDR"><block var="lists"/></block></custom-block><script><block s="doReport"><block s="evaluate"><block var="mapone"/><list><block s="reportListItem"><l>1</l><block var="lists"/></block></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="mapmany"/><list><block var="lists"/></list></block></block></script></block></script></block></script></block-definition><block-definition s="empty? %&apos;data&apos;" type="predicate" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportVariadicEquals"><list><block var="data"/><block s="reportNewList"><list></list></block></list></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%predRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doIfElse"><block s="evaluate"><block var="pred"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><script><block s="doReport"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></block></script><script><block s="doReport"><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></script></block></script></block></script></block-definition><block-definition s="combine with %&apos;function&apos; items of %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="data"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="data"/></block></block></script><list></list></block><block s="doReport"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="combine with %repRing items of %l"><block var="function"/><block s="reportCDR"><block var="data"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; then %&apos;true&apos; else %&apos;false&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%b"></input><input type="%anyUE"></input><input type="%anyUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doReport"><block s="evaluate"><block var="true"/><list></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="false"/><list></list></block></block></script></block></script></block-definition><block-definition s="for %&apos;i&apos; = %&apos;start&apos; to %&apos;end&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%n">1</input><input type="%n">10</input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>step</l><l>tester</l></list></block><block s="doIfElse"><block s="reportVariadicGreaterThan"><list><block var="start"/><block var="end"/></list></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicLessThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script><script><block s="doSetVar"><l>step</l><l>1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicGreaterThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script></block><block s="doSetVar"><l>i</l><block var="start"/></block><block s="doUntil"><block s="evaluate"><block var="tester"/><list></list></block><script><block s="doRun"><block var="action"/><list></list></block><block s="doChangeVar"><l>i</l><block var="step"/></block></script></block></script></block-definition><block-definition s="join words %&apos;words&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%mult%txt"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script><list></list></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" 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s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="Grocery 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